to begin we hear from john miller and then jim axel rod. to begin we hear from john miller and then jim axel rod. >> reporter: it was a week of images, both frightening and inspiring. the chaos of a terrorist attack and the heroism of the response. in erie videos from security cameras we saw brothers tamerlan and dzhokhar tsarnaev allegedly on the way to place the bombs. and then the gripping 28-hour manhunt. there was an ambush that left a young police officer dead. and a gun battle that left a transit police officer badly wounded and ended the life of tamerlan tsarnaev. dzhokhar tsarnaev, his younger brother, was lost spotted in this infrared photo hiding inside a boat as the drag net closed in around him. his f.b.i. wanted poster now marked captured is the image that puts to a close the first chapter in the story of the boston marathon bombing. and so the next chapter opens with nothing but questions. questions posed by the president himself. >> why did young men who grew up and studied here as part of our communities and our country res